Color Conversion Optical Fiber for Single-Laser Backlight Units
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in obtaining a desired wavelength band or color, such as white light, as they require multiple laser light emitting elements or complex optical films to convert single-wavelength light, leading to inefficiencies in light extraction and configuration complexity.
Innovation Solution
An optical fiber with a core and cladding structure that includes color conversion materials in specific crevices, allowing for the conversion and mixing of light wavelengths to achieve desired colors without the need for multiple optical fibers or separate films, using a single laser light emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple laser light emitting elements are used to obtain desired wavelength bands or colors, then the desired color output is achieved, but the device complexity and configuration complexity increase
Solution Approach 1:
The patent applies parameter changes by modifying the optical properties of the fiber through color conversion materials. Instead of changing the number of light sources, the invention changes the wavelength parameter of the light by incorporating materials that convert the wavelength of light from the single laser source to achieve desired color outputs.
Solution Approach 2:
The patent uses composite materials by incorporating color conversion materials within the optical fiber structure. The fiber comprises a core and cladding with color conversion materials positioned in the cladding, creating a composite structure that enables wavelength conversion while maintaining a single light source configuration.
2Illumination intensity
If optical films are added to convert light wavelength, then the desired wavelength band is obtained, but the light extraction efficiency decreases due to loss of emitted light
Solution Approach 1:
The patent merges the wavelength conversion function directly into the optical fiber structure by incorporating color conversion materials within the fiber's cladding. This integration eliminates the need for separate optical films, reducing light loss at interfaces and improving overall light extraction efficiency while achieving the desired wavelength conversion.
3Illumination intensity
If multiple optical fibers connected to multiple laser light emitting elements are arranged, then the desired wavelength band is obtained, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing a single optical fiber that performs multiple functions: light transmission, wavelength conversion, and color mixing. The fiber with color conversion materials in the cladding can generate multiple wavelength bands from a single laser source, making the fiber a multi-functional component that replaces multiple specialized fibers.
Solution Approach 2:
The invention changes the optical parameters within the fiber by incorporating color conversion materials that modify the wavelength and spectral characteristics of the transmitted light. This allows a single fiber to provide multiple wavelength outputs by changing the optical properties through the embedded materials rather than using multiple fibers with different properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient conversion of single-wavelength light to desired colors like white light within the optical fiber, simplifying device configuration and improving light extraction efficiency by eliminating the need for additional optical films.
Implementation Method 1
the optical fiber uses a laser light emitting element that provides a high efficiency of a blue light, and includes a material that converts a blue light emitted from the laser light emitting element to a light of a different wavelength band
Data Source
AI summary
The present disclosure relates to an optical fiber capable of converting a wavelength of a light emitted from a light source and a backlight unit using the same.According to the present disclosure, it is possible to extract a light of a desired wavelength band or a desired color (for example, a white light) by connecting an optical fiber, to which a color conversion material is applied, to a single laser light emitting element that emits a light of a specific wavelength band.